What does the depolarization of the transverse tubules (T-tubules) promote?
A) binding of acetylcholine to ligand-gated sodium ion channels
B) release of calcium from the sarcoplasmic reticulum
C) entry of sodium ions into the muscle fiber through voltage-gated sodium ion channels
D) release of acetylcholine from vesicles in the motor neuron into the synaptic cleft
Answer: B
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